How do I install the Cis Tomcat101 3.2 skill?

Run npx skillmds@latest add cyberstrikeus/cis-tomcat101-3-2 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Cis Tomcat101 3.2 skill do?

Disable the Shutdown port (Automated) It is listed under Coding & Dev Tools on SkillMD.

Is Cis Tomcat101 3.2 safe to use?

SkillMD's automated safety review verdict for this skill is PASS. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Cis Tomcat101 3.2?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Cis Tomcat101 3.2 free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Cis Tomcat101 3.2?

cyberstrikeus (@cyberstrikeus) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Cis Tomcat101 3.2 by cyberstrikeus — Agent Skill

Name: Cis Tomcat101 3.2
Author: cyberstrikeus

File contents

Disable the Shutdown port (Automated)

Description

Tomcat listens on TCP port 8005 to accept shutdown requests. By connecting to this port and sending the SHUTDOWN command, all applications within Tomcat are halted. The shutdown port is not exposed to the network as it is bound to the loopback interface. If this functionality is not used, it is recommended that the shutdown port be disabled.

Rationale

Disabling the Shutdown port will eliminate the risk of malicious local entities using the shutdown command to disable the Tomcat server.

Audit Procedure

Perform the following to determine if the shutdown port has been disabled: Ensure the port attribute in $CATALINA_HOME/conf/server.xml is set to -1.

$ cd $CATALINA_HOME/conf/
$ grep '<Server[[:space:]]\+\[[^]]*port[[:space:]]*=[[:space:]]*"[[:space:]]*-1"' server.xml

Remediation

Set the port to -1 in the $CATALINA_HOME/conf/server.xml to disable the shutdown port:

<Server port="-1" shutdown="SHUTDOWN">

Default Value

The shutdown port is enabled on TCP port 8005, bound to the loopback address.

References

https://tomcat.apache.org/tomcat-9.0-doc/config/server.html

CIS Controls

v8:

4.4 Implement and Manage a Firewall on Servers
- Implement and manage a firewall on servers, where supported. Example implementations include a virtual firewall, operating system firewall, or a third-party firewall agent.
4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software
- Uninstall or disable unnecessary services on enterprise assets and software, such as an unused file sharing service, web application module, or service function.

v7:

1.7 Deploy Port Level Access Control
- Utilize port level access control, following 802.1x standards, to control which devices can authenticate to the network. The authentication system shall be tied into the hardware asset inventory data to ensure only authorized devices can connect to the network.
9.2 Ensure Only Approved Ports, Protocols and Services Are Running
- Ensure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system.

Profile Applicability

Level 2

---name: cis-tomcat101-3-2description: Disable the Shutdown port (Automated)---# Disable the Shutdown port (Automated)## DescriptionTomcat listens on TCP port 8005 to accept shutdown requests. By connecting to this port and sending the SHUTDOWN command, all applications within Tomcat are halted. The shutdown port is not exposed to the network as it is bound to the loopback interface. If this functionality is not used, it is recommended that the shutdown port be disabled.## RationaleDisabling the Shutdown port will eliminate the risk of malicious local entities using the shutdown command to disable the Tomcat server.## Audit ProcedurePerform the following to determine if the shutdown port has been disabled: Ensure the port attribute in `$CATALINA_HOME/conf/server.xml` is set to -1.```bash$ cd $CATALINA_HOME/conf/$ grep '<Server[[:space:]]\+\[[^]]*port[[:space:]]*=[[:space:]]*"[[:space:]]*-1"' server.xml```## RemediationSet the port to -1 in the `$CATALINA_HOME/conf/server.xml` to disable the shutdown port:```xml<Server port="-1" shutdown="SHUTDOWN">```## Default ValueThe shutdown port is enabled on TCP port 8005, bound to the loopback address.## References1. https://tomcat.apache.org/tomcat-9.0-doc/config/server.html## CIS Controls**v8:**- 4.4 Implement and Manage a Firewall on Servers - Implement and manage a firewall on servers, where supported. Example implementations include a virtual firewall, operating system firewall, or a third-party firewall agent.- 4.8 Uninstall or Disable Unnecessary Services on Enterprise Assets and Software - Uninstall or disable unnecessary services on enterprise assets and software, such as an unused file sharing service, web application module, or service function.**v7:**- 1.7 Deploy Port Level Access Control - Utilize port level access control, following 802.1x standards, to control which devices can authenticate to the network. The authentication system shall be tied into the hardware asset inventory data to ensure only authorized devices can connect to the network.- 9.2 Ensure Only Approved Ports, Protocols and Services Are Running - Ensure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system.## Profile Applicability- Level 2

Frequently asked questions

Cis Tomcat101 3.2